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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3672) Expose disk-location information for blocks to enable better scheduling
Date Mon, 13 Aug 2012 13:19:38 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13433124#comment-13433124
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Arun C Murthy commented on HDFS-3672:
-------------------------------------

I'd really encourage you to put this into the DataNode and throw an UnsupportedOperationException
rather than merely do this via a client-side config.

                
> Expose disk-location information for blocks to enable better scheduling
> -----------------------------------------------------------------------
>
>                 Key: HDFS-3672
>                 URL: https://issues.apache.org/jira/browse/HDFS-3672
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 2.0.0-alpha
>            Reporter: Andrew Wang
>            Assignee: Andrew Wang
>         Attachments: design-doc-v1.pdf, design-doc-v2.pdf, hdfs-3672-1.patch, hdfs-3672-2.patch,
hdfs-3672-3.patch, hdfs-3672-4.patch, hdfs-3672-5.patch, hdfs-3672-6.patch, hdfs-3672-7.patch,
hdfs-3672-8.patch
>
>
> Currently, HDFS exposes on which datanodes a block resides, which allows clients to make
scheduling decisions for locality and load balancing. Extending this to also expose on which
disk on a datanode a block resides would enable even better scheduling, on a per-disk rather
than coarse per-datanode basis.
> This API would likely look similar to Filesystem#getFileBlockLocations, but also involve
a series of RPCs to the responsible datanodes to determine disk ids.

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